Rotary pivoted hammer



New 27 1928.

H. J. SHELTQN ROTARY PIVOTED HAMMER Filed Jan. 18, 1928 Patented Nov. 27, 1928.

UNITED STATES HARRY J'. SHELTON, 0]? UNIVERSITY CITY, MISSOURI.

ROTARY PIVOTED HAMMER.

Application filed January 18, 1928. Serial N @-2 47,539.-

This invention relates to certain new and useful improvements in rotary pivoted hammers, the peculiarities of which will be hereinafter fully described and claimed.

The main object of my invention is to provide a rotary pivoted hammer as used in rock :rushers, with a reversible head member adapted for heavy duty and extreme wear and to mount such head on a shank member pivoted on its hammer rod as usual, so that the head, can be readily reversed and renewed without removing the rods; and secondly, to provide mutually reentrant projections and matching recesses for head and shank adapted to resist the circumferential force of impact of the head on the rock undergoing reduction, and suitable fastening means to resist the centrifugal tendency of the head under rotation.

Incrushing rock and other material with rotary pivoted hammers of the usual one-.

piece design, it is customary to reverse the hammers on the rods when the front corner is worn off rounding so that the length is shortened and the hammer is rendered less efficient. This reversal necessitates with onepiece rods, removal of the hammers and replaclng of the rods after such reversal. The hammers for heavy duty are relatively heavy 100 lbs. or more,-and the labor of handling them is correspondingly'heavy.

My improved hammer provides a head so mounted on the shank portion of the hammer that said head can be readily removed, reversed or replaced without wlthdrawing the pivot rods and removing the shank which simply remains in position on the rod, and the consequent labor with my form of hammer is greatly reduced. Also my shank serves for any number of heads in succession, instead of bein discarded as in the one-piece hammer. ther advantages will appear later.

In the accompanying drawing on which like reference numerals indicate corresponding parts.

Fig. 1 represents an edge view of a hammer exemplifying my improvements;

Fig. 2, a side view of the same;

Fig. 3, a radial sectional view through the pivot on the line 3'3 of Fig. 2;

Fig. 4;, a View of the pivot shank only in cabinet projection; and

Fig. 5, a similar view of the head only.

The numeral 1 designates a separate head mounted on a shank 2 having an eye 4 for hammers the withdrawal of the pivot.

mounting on a hammer rod in the usual rotary cylinder of a crusher. A boss 5 for the eye is preferably thicker than the outer end 6 of the shank which has a terminal tenon 7 projecting beyond transverse faces 8 of front and rear flanges located on opposite sides of the radial axis, and is about half the width transversely between lateral faces of said end 6. The side faces 9 of said tenon extend downward and form inner lateral radial walls of reentran't recesses on each side of the tenon in the end 6 which lateral walls are substantially as deep below said transverse front and rear flange faces 8 as said tenon projects beyond the same. The front and rear edge surfaces 10 of said tenon are preferably tapering outwardly, and the front and rear edge walls 11 of said recesses preferably taper inwardly towards the pivot eye as shown, so that with the top 12 of the tenon and the bottom 13 of the recess, the side faces of said tenon form hexagons through the centers of which passes a hole 14, cylindrical or otherwise, and with its center lying practi'ally in the horizontal transverse plane of the said transverse flange faces 8. The tenon connects the middle of each of the said flange faces like the bar of the letter H.

The head member 1, Fig. 5, is substantially the same width and length transversely of the shank end 6, and has transverse bottom faces 15 corresponding to the flange faces 8, between which bottom faces is located a mor-' tise 16 extending upwardly in the head and adapted to receivethe sald terminal tenon 7. At each side of said mortise are radially downwardly extending lugs 17 having tapering edge surfaces 18 at front and rear that are adapted to match said corresponding edge walls 11 of the recesses when the head is mounted on the shank as in Fig. 2. The front and rear edge walls 19 of the mortise are adapted to match the corresponding edge surfaces 10 of the tenon, and preferably bear thereon when the head is mounted on the shank, since these edge surfaces of the tenon are nearest the outer corners 20 of the head where the force of the blow is greatest. It is desirable that the said front and rear edge surfaces 18 of the radially depending lugs also bear on the edge walls 11 of the recesses and thus distribute the impact stress over the shank end.

The lugs have holes 21, passing transversely from side to side thereof and cylindrical or otherwise matching the corresponding hole in the tenon when the head is mounted, that provide for a pin or other fastening piece 22, cylindrical or otherwise, that fastens the lugs of the head to the tenon of the shank against the centrifugal tendency of the head under rotation, and brings the matching walls of the mortise and edge faces of the lugs into engagement with the tenon and edge walls of the recesses respectively. Said pin has a head. 23 preferably let into a guarding recess 24 in the outer side face of one lug, While the other end has a hold for a cotter 25 that is also let into a radially grooved guarding recess 26 in the outer side face of the opposite lug, as shown in Figs. 2 and 3. When the front corner of the head is worn down as indicated by the dash line Fig. 2, the pin or other fastening piece is removed, the head taken off and turned around and replaced on the shank and the pin inserted again. When the opposite corner is worn down in a similar manner, a new head in replacement restores the full efficiency of the hammer.

The tenon and side recesses are preferably on the shank member and the corresponding mortise and lugs on the head member as shown, but they may be reversed without de parting from the spirit of my invention. The hexagonal tenon and lugs afford radially tapering projections that provide each with a wide base in the transverse horizontal plane through the pin and the matched flange faces 8 and 15, thus promoting the strength of the reentrant projections; but the laterally adjacent faces of the tenon and mortise may be otherwise than the hexagonal form shown if desired, without departing from the spirit of my invention, although such is the preferred form for the reason stated above.

I claim:

1. A rotary pivoted hammer comprising a pivotal shank having a terminal tenon tapering radially outward and a lateral recess at each side of said tenon tapering radially inward, a head detachably mounted on said shank and having a mortise and depending lateral lugs corres onding to said tenon and recesses respective ythe adjacent faces of said tenon with recesses and mortise with lugs being hexagonal,and fastening means connecting said head and shank.

2. A rotary pivoted hammer comprising a shank member and a head member detachably mounted thereon-one member having a tenon radially disposed and extending above and below transverse bearing flanges, and the other a corresponding mortise,and fastening means for said members.

3. A rotary pivoted hammer comprisinga shank member and a head member detachtending from side to side substantially in the transverse plane of said bearing flange surfaces,and fastening means passing through said holes.

4. A rotary pivoted hammer comprising a shank having aterminal tenon tapering radially outward and reentrant side recesses tapering radially inward and located adjacent to the inner half of said tenon and extending for half its radial length, a reversible head detachably mounted on said shank and having a mortise corresponding to said tenon and depending side lugs adapted to enter said recesses,the tenon and lugs having holes connecting lateral-faces and adapted to match-and fastening means mounted in said holes.

5. A rotary pivoted hammer comprising a shank member having transverse faces forming flanges at front and back and having an intermediate terminal tenon connecting said flanges and extending radially downward to form reentrant side recesses substantially as deep below said flanges as the tenon extends outward beyond the flanges and having a hole in the plane of said flanges, a reversible head detachably mounted on said shank and having a mortise corresponding to said tenon and depending side lugs corresponding to said recesses and provided with a hole corresponding to that in the tenon, and fastening means mounted in said holes in matching position.

6. A rotary pivoted hammer comprisinga pivotal shank having transverse front and rear flanges located on opposite sides of the radial axis, and an intermediate terminal tenon of lesser width connecting the middle of each of said flanges like the letter H and extending radially downward forming side recesses below said flanges, a reversible head having a mortise and depending side lugs corresponding to said tenon and recesses respectively-the tenon and lugs having holes adapted to match,-a pin mounted in said holes and having a head guarded by a recess in the adjacent lug, and a cotter in the opposite end guarded by a recess in the other lug.

In testimony whereof I have aflixed my signature.

HARRY J. SHELTON. 

